Prediction of Joint Durability between Adhesive Resin Cement and Dental Alloy.

在工业领域，R.A.GlendHill等人提出了新的解决方案。(J.Adhesion，1980，Vol.11，p3-15)提出了一种预测接头耐久性的方法，该方法只需胶粘剂中的扩散系数和平衡吸水率以及短期机械性能的信息。这项研究的目的是确定是否有可能使用这种分析来预测拉伸对接接头的接头耐久性，该对接接头由牙科12%Au-Ag-Pd合金与商业4-Meta牙科粘接树脂粘结剂粘结在20ﾟ、37ﾟ、50ﾟ和60ﾟC的水中组成。根据菲克吸水方程以及水泥中的扩散系数和平衡吸水量计算树脂粘固剂与合金界面的渗透量。根据美国材料试验学会标准获得应力强度因子，并测定其在60ﾟC水中浸泡3天的拉伸粘结强度。使用这些值和水浓度分布，然后推导出连接的断裂应力值作为测试前温度和浸泡时间的函数。为了确保节点耐久性的预测是合理的，将理论预测值与60ﾟC下试验测得的强力值进行了比较，预测值与实验值吻合良好。

In industrial field, R.A.Glendhill et al. (J.Adhesion, 1980, vol.11, p3-15) developed a method for predicting the joint durability which only required the information about the diffusion coefficient and equilibrium water uptake in adhesives and the short-term mechanical properties. The object of this study is to determine whether it is possible to use this analysis for predicting the joint durability of tensile butt joints, consisting of a dental 12% Au-Ag-Pd alloy bonded with a commercial 4-META dental adhesive resin cement immersed in water at 20ﾟ,37ﾟ,50ﾟ and 60ﾟCThe amount of water penetrated at the interface between the resin cement and the alloy was calculated from the Fick's equation for water absorption, and the diffusion coefficient and equilibrium water uptake in the cement. The stress-intensity factor was obtained according to the ASTM standard, and the tensile adhesive strength immersed in water at 60ﾟC for three days was also determined. Using these values and the water concentration profile, values of joint's fracture stress were then deduced as a function of the temperature and immersion time prior to testing. To make sure that the prediction of the joint durability is appropriate, the theoretically predicted values were compared to the experimentally determined strength values at 60ﾟC.The agreement between the prediction and experimental measurements was good.